- 7 A Refractory Combustion Unit Lined With No Water Wall And No Heat Recovery Is Burning Refuse Derived Fuel Rdf Consi 1 (39.68 KiB) Viewed 42 times
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7) A refractory combustion unit lined with no water wall and no heat recovery is burning refuse-derived fuel (RDF) consisting of 85% organics, 10% water, & 5% inorganics or inerts at a rate of 950 kg/hr. Determine the temperature, T, at which ash exits the combustion chamber in both °C and °F), assuming the following: Heat value of the fuel = 19,000 kJ/kg on a moisture-free basis. Air flow = 9,500 kg/h & that the under- & overfire air contributes negligible heat. 5% of the heat input is lost due to radiation 15% of the fuel remains uncombusted in the ash Specific heat of ash=0.837 kJ/kg/°C, Specific heat of air is 1.0 kJ/kg/°C. Latent heat of vaporization = 2575 kJ/kg. Temperature of the stack gases = 1500°C